////////////////////////////////////////////////////////////////////
// Send Address To
////////////////////////////////////////////////////////////////////
private void SendAddressTo
(
string Type,
List <SecureSmtpMailAddress> AddressList
)
{
// nothing to do
if (AddressList.Count == 0)
{
return;
}
// build list
StringBuilder List = new StringBuilder();
// send one address at a time
foreach (SecureSmtpMailAddress MA in AddressList)
{
if (List.Length == 0)
{
// send first item of the list
List.AppendFormat("{0}: {1} <{2}>", Type, SecureSmtpPart.Utf8Base64Encode(MA.DisplayName), MA.Address);
}
else
{
// append all others
List.AppendFormat(",\r\n {0} <{1}>", SecureSmtpPart.Utf8Base64Encode(MA.DisplayName), MA.Address);
}
}
// send the list
SendDataLine(List.ToString());
return;
}
/// <summary>
/// Add child part to list of parts
/// </summary>
/// <param name="Part">Derived class from SecureSmtpPart</param>
public void AddPart
(
SecureSmtpPart Part
)
{
Children.Add(Part);
return;
}
////////////////////////////////////////////////////////////////////
// Send subject line to the server.
////////////////////////////////////////////////////////////////////
/*
* To encode a header using this technique you must use this format:
* =?charset?encoding?encoded-text?=
* And this is an example of its use:
* =?utf-8?Q?hello?=
* The encoding must be either B or Q, these mean base 64 and quoted-printable respectively.
* You can read the RFC 1342 document for more information about how they work.
*
* // convert content string unicode to byte array
* byte[] ContentBytes = Encoding.UTF8.GetBytes(ContentString);
* string EncodedText = "=?utf-8?Q?" + QuotedPrintableEncode(ContentBytes) + "?=";
*/
private void SendSubjectLine
(
string Text
)
{
#if DEBUG
Debug.WriteLine("Subject: " + Text);
#endif
// test for unicode characters (not ascii)
bool Unicode = false;
foreach (char Chr in Text)
{
if (Chr > '~')
{
Unicode = true;
break;
}
}
// we need special encoding
if (Unicode)
{
// convert content string unicode to byte array
byte[] SubjectBytes = Encoding.UTF8.GetBytes(Text);
string SubjectText = SecureSmtpPart.QuotedPrintableEncode(SubjectBytes, false);
// send subject
Writer.Write("Subject: =?utf-8?Q?");
Writer.Write(SubjectText);
Writer.Write("?=\r\n");
}
else
{
// send subject
Writer.Write("Subject: ");
Writer.Write(Text);
Writer.Write("\r\n");
}
return;
}
/// <summary>
/// Send the email message to the mail server
/// </summary>
/// <param name="Message">Email message</param>
public void SendMail
(
SecureSmtpMessage Message
)
{
try
{
if (string.IsNullOrWhiteSpace(Message.Subject))
{
throw new ApplicationException("Email subject is missing");
}
if (Message.From == null || string.IsNullOrWhiteSpace(Message.From.Address))
{
throw new ApplicationException("From address is missing or in error");
}
if (Message.To.Count == 0)
{
throw new ApplicationException("At least one mail to address is required");
}
foreach (SecureSmtpMailAddress MA in Message.To)
{
if (string.IsNullOrWhiteSpace(MA.Address))
{
throw new ApplicationException("To mail address address is missing");
}
}
foreach (SecureSmtpMailAddress MA in Message.Cc)
{
if (string.IsNullOrWhiteSpace(MA.Address))
{
throw new ApplicationException("CC mail address address is missing");
}
}
foreach (SecureSmtpMailAddress MA in Message.Bcc)
{
if (string.IsNullOrWhiteSpace(MA.Address))
{
throw new ApplicationException("To mail address address is missing");
}
}
// open connection
OpenConnection();
// send host name and expect request completed 250
SendCommand("EHLO " + Host, SmtpReplyCode.RequestCompleted);
// get supported authorization from last reply
SupportedAuthorizations();
// plain text authentication method
if (AuthMethod == Authentication.PlainText)
{
if ((SupportedAuth & AuthenticationMethod.PlainText) == 0)
{
throw new ApplicationException("Email server does not support plain text authorization");
}
SendCommand("AUTH LOGIN", SmtpReplyCode.SendUserAndPassword);
SendCommand(Convert.ToBase64String(Encoding.ASCII.GetBytes(UserName)), SmtpReplyCode.SendUserAndPassword);
SendCommand(Convert.ToBase64String(Encoding.ASCII.GetBytes(UserPassword)), SmtpReplyCode.AuthenticationSuccessful);
}
// OAuth2 authentication method
else
{
if ((SupportedAuth & AuthenticationMethod.XOAuth2) == 0)
{
throw new ApplicationException("Email server does not support XOAUTH2 authorization");
}
string OAuth2Password = OAuth2.OAuth2Password();
string AuthStr = string.Format("user={0}\u0001auth=Bearer {1}\u0001\u0001", UserName, OAuth2Password);
byte[] AuthBin = new byte[AuthStr.Length];
for (int x = 0; x < AuthStr.Length; x++)
{
AuthBin[x] = (byte)AuthStr[x];
}
SendCommand("AUTH XOAUTH2 " + Convert.ToBase64String(AuthBin), SmtpReplyCode.AuthenticationSuccessful);
}
// from address
SendCommand(string.Format("MAIL FROM: <{0}>", Message.From.Address), SmtpReplyCode.RequestCompleted);
// send the addresses of all recipients
SendRecipientAddress(Message.To);
SendRecipientAddress(Message.Cc);
SendRecipientAddress(Message.Bcc);
// start data block
SendCommand("DATA", SmtpReplyCode.StartInput);
// send from
SendDataLine(string.Format("From: {0} <{1}>", SecureSmtpPart.Utf8Base64Encode(Message.From.DisplayName), Message.From.Address));
// send to list
SendAddressTo("To", Message.To);
SendAddressTo("Cc", Message.Cc);
// send subject
SendSubjectLine(Message.Subject);
// send date and time
SendDataLine(string.Format("Date: {0:r}", DateTime.UtcNow));
// send mime vertion
SendDataLine("MIME-Version: 1.0");
// send all data parts
Message.RootPart.SendData(Writer);
// data terminating dot
SendCommand("\r\n.", SmtpReplyCode.RequestCompleted);
// terminate connection
SendCommand("QUIT", SmtpReplyCode.ClosingChannel);
// dispose connection
Dispose();
return;
}
catch (Exception Exp)
{
try
{
SendCommand("QUIT", SmtpReplyCode.IgnoreReply);
}
catch { }
// dispose connection
Dispose();
throw new Exception(Exp.Message, Exp);
}
}